Telephone-exchange system



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TELEPHONE EXCHANGE SYSTEM Filed March 31, 1925 l5 Sheets-Sheet l5 Feb. 1, 1927.

Patented Feb. l, 1927..

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ANI) THOMAS H. ROBERTS, OF NEW YORK, N. Y., ASSIGNRS, BY MESNE ASSIGNIJIENTS. TO WTESTEBN ELECTRIC COM- PANY, NCORPORATED, A CORPORATION OF NEVI YORK.

TELEPHONE-EXCHANGE SYSTEM.

Application led March 31, 1925.

The present invention relates to telephone exchange systems and particularly to register senders for controlling the establishment of connections in power driven automatic. telephone systems.

lt is customary in such telephone systems to establish what is known as fundamental circuit including a stepping relay in the sender for controlling the extent of operation of the selector switches. ln controlling the selection of a particular line the fundamental circuit may be completed entirely within one oce or it may include sender apparatus in one office and selector apparatus at a different office. ln large multi-odice areas in which power driven apparatus is most frequently used the distance between offices varies greatly and therefore the resistance of the line connecting` the sender apparatus with the selector apparatus may vary from a negligibly small amount to a considerable value. The operation of selector switches must be very rapid and a stepping relay must operate. a number of times to position each selector switch. In order to obtain such rapid operation and release of a stepping relay its adjustment must be held within close limits. For this reason it is obvious that a stepping relay adjusted for use over the low resistance lines could not operate efficiently over the high resistance line and vice versa.

lt is also customary during the progress of a call to test the adjustment of the relay of certain selectors which are included in the fundamental circuit. As in the case of the stepping relay the same test conditions should not be applied to selector relays reached over fundamental circuits of widely different resistances.

lt is an object of the present invention to provide means in a register sender for the selection of fundamental circuit apparatus in accordance witl the characteristics of the trunk line extending to the office to which a call is extended.

n. feature of the invention is the provi- Serial No. 19,584.

sion of a plurality of stepping relays and means for selecting the proper stepping relay to efliciently operate under the particular fundamental circuit conditions involved.

Reference is made to U. S. Patent No., 1,395,977 to F. A. Stearn et al., granted November 17 1921 and to ll. S. Patent No. lfllaOS to A. E. Lundell et al., granted August 7, 1923 for disclosures of the operation of a register sender for use in a power driven automatic telephone system.

Referringnow to the drawings, Fig. 1 shows in diagrammatic form a subscribers line with selectors for extending said line and a sender for controlling such selectors.

Fig. 2 shows a district selector at a tandem oflice.` Y

Fig. 3 shows an outgoing selector at the tandem oliice, the incoming and fina-l selector ata third office and call indicator apparatus at still another oiiice.

Fig. 4 shows an allotter switch for allotting link circuits.

Fig. 5 shows a linlr circuit for associating the sender and the district selector of F ig, 2. l

Fig. 6 shows a timing switch and means for controlling the wipe out of a call.

Fig. 7 shows the means for receiving code impulses from the distant office and the transfer relays for directing t-he registration of said impulses.

Fig. 8 shows a plurality of relay registers for registering the relay call indicator impulses received.

Fig. 9 shows, the `counting` relays and sequence switch for controlling selections.

Fig. 10 shows sequence switch and apparatus for controlling the selection and setting of the translator.

Fig. 11 shows a group of registers for controlling the setting of the translator.

Fig. 12 shows the class switches and the relay call indicator impulse generating switch. l

Fig. 13 shows another set of registers for receiving the record as translated.

Fig. 14 shows one of a plurality of connecting switches by means oi' which the translator is connected with the sender.

Fig. 15 shows a translator and impulse machine.

Fig. 16 shows the arrangement ot Figs. 1 to 15 inclusive, to disclose the invention.

Before proceeding with the detail description ot the operation a brietq summary ot the operation may be desirable.

General description..

`When the subscriber at substation 100 in oiiice X removes his receiver trom the hoolr the line switch 101 functions to connect the line With an idle district selector such as 102. The district selector' causes the association therewith of the register sender 104. The subscriber then dials the number of the Wanted subscriber. resuming that the otlice code is one which requires extension through a tandem oliice, the sender Will control the district selector 102 and the otlice selector 103 to select an outgoing trunlr to the tandem oitice Y. YVhen the call is received at district selector 200 a circuit is completed through the allotter of Fig. t to cause the link circuit ot Fig. 5 to hunt tor and nd the district selector 200 and also to hunt Jfor an idle sender.

l'Vhen the sender has been found, the districtselector 200 causes the sender st to transmit code impulses corresponding to the complete designation as registered on that sender, which impulses are recorded on the registers ot Fig. 8. As soon as the registers of Fig. 8 have been set, the registration is trans'lerred to the registers ot Fig. 11. According to the setting ot these registers, one of the relays 1007, 1011, 101i` or 1013 ie operated to start a iinder switch, such as that shown in Fig. 11, hunting for an idle t 'anse lator in the group corresponding to the relay operated. Translator' 1500 is then po sit-ioned under the control. of the registers oi Fig. 11, the counting relays of Fig. and sequence switch 1010 to select the terminals corresponding to the particular oliice code dialed. As soon as translator 1500 is positioned circuits are established between the pulse machine 1550 and the register relays ot Fig. 13 to set up thereon the designations necessary to select the desired otlice.

Vhen the register relays Fig. 13 have been set the translator is released and the class switch 19,00 is positioned in accordance with the geographic location o't the otlice Yfor which the registers and register relays have been set. The proper stepping relay and resi ance conditions are non7 selected in accordance with the position ot the class switch and the action ot the sender inv completing selections is controlled in the usual manner. it the distant oihce 1s a manual oliice, code relay call indicator pulses are transmitted to indicate to the operator at station Z the number of the wanted subscriber.

Detailed description.

Assume that the subscriber' at substation 100 located at oliice X desires to talk to a subscriber at substation 380 located at otlice Z which may be reached only througl'i the tandem otlice Y. The subscriber dials the number of the wanted line. rlhe line 100 will he extended, as briefly set forth above, to oiiice Y. For a description et' the registration ot the wanted niunber on the sender and the action oi said sender in controlling the eX- tcnsion to the ianted line, reference may oe made to U. S. Patent No. 1,395,977 to F. A. Stearn et al., granted November 1, 1921, a nd Yl'or a deecription ot' the method ot sending` code pulses reference may be made to Patent No. Ltst, to A. E. Lundell et al., ir-rsued August 7, 1923.

lllheu oilice selector 103 selects a trunk loading to Yan idle district selector at the tandem ol'lice. which it is assumed is district selector 200 a relay (not shown) at sender iU-l Twill be bridged across trunk conductors and completing a circuit for relay '.101 which iii-ay he traced troni battery at the outer lett back contact ot relay 2341, lett Winding ot relay 201, lower lett contact ot cani 203, upper back contact ot relay Q02, over trunk conductor 2.19, through otiice lector 103, and district selector 102, through the above mentioned relay in the sender 104i, back through dstrict selector 102 and ottice selector 1023, lrunli conductor 250, inner louer back contact ot relay 202, lower right contact- 0i2 cani Q04, right Winding ot relay 201, inner right back contact ot relavv 231 to ground. The operation ot relay Q01 closes a circuit trom attery through the winding ot relay Q05, louer r'hlt contact o't' cani 200, outer lett baci; contact ot relay T, lower contacts ot cam 208, front contact ot' relay 201 to ground.

lt may be stated at this point ot the description that when allotter 110 of Fig. -l i i i one ot positions 1 to 10, allotter 450 remains in position 17. liet it be assumed ior this description that allotter 110 is in position 1. lfheretore when relay Q05 operates it closesl a circuit troni ground at its inner iei't iront contact, over the upper right and lower lc'l't contacts oiE cam 209, conductor L105, Contact o1' key 10ft, lett back contact ot relay 4:03, lett back contact ct relay 401, right contact oi: cani '1i-0h, Winding o relay L100 to battery. Relay 400 closes a circuit from battery through non-inductive resistance #107., `winding ot relay 409, outer contact ot relay i100 to ground. Relay 4108 operates and elo: ,a a circuit 'from battery through the 'Windingl ot relay 503, lettrbacl contact of relay 502, contact ot Jack 501, conductor 111, lett contact of cam 409, contact of relay 108 to ground. Relay 503 in operating locks over its innerright contact, right back contact ot' relay 502, conductor 504 to ground at the inner contact ot relay L100.

Relay 508 in operating also closes a circuit from battery through the winding of relay 505, inner lett contact ot relay 508 to ground. The circuits closed by the operation of relay 505 will be discussed later. Relay 503 closes a circuit extending from batt-cry through the non-inductive resistance L107, middle contact ot relay 100, conduct-or 506, middle right contact of relay 503, conductor 507, left bach Contact of relay L112 to ground. This circuit shunts the Winding oit relay L2108 and permits thatl relay to release, thus opening the energizing circuit ot relay 503. A circuit is also closed from battery through the Winding ot start magnet 510, back contact ot' relay 511, outer let'tcontact of relay 503 to ground. rllhe power driven switch 500 is rotated under the control ot magnet 5.10 until brush 512 engages the terminal con nected to the districtsclector 200 which terminal is connected with ground, thus closing a circuit from battery, through the Winding ot relay 508, and from battery through the Winding of stop magnet 511 and back contact of relay 518, in parallel, over the outer right contact of relay 503, brush 512, and the terminal corresponding to selector 200, conductor 509, lower contacts of cam 212, outer lett t'ront contact of relay 205, right contact ot cam 213 to ground.

It Will be noted that in the case ol' a district selector which has not been selected tor use relay 205 will not be operated and the path troni ground will not be extended to a terminal associated with brush 512. Relay 508 and magnet 511 ope-rate in the above traced circuit, magnet 511 serving to open the circuit ot magnet 510, brimging` the switch 500 to rest on the terminals leading to selector 200. Relay 508 closes a circuit -from battery through the winding of relay 518, outer right liront contact ot relay 508, to `ground. Relay 518 operates and closes a locking circuittor itself over its inner right contact, left winding of relay 519, brush 518 to conductor trom whence the circuit extended to ground as will be subsequently described. Relay 518 also closes an obvious circuit for relay 502, closes a holding` circuit for relay 511 at its inner lett alternate contact. and closes a .new holding circuit tor rela y which extends over the inner rightcontact ot relay 505:3, inner right iront contact olE relay 508, outer lett 'liront contact oit relay 518` outer left front Contact of relay to ground.

The operation oll relay 502, opens the first traced locking circuit tor relay 503, closes a holding circuit for relay 505 at its middle right Contact, and closes a circuit from battery through the left Winding ot relay 207, upper lett and lower rightcontacts oit cani 21a, conductor 529, brush 514 and it-s corresponding terminal, lett -iront contact ol relay 502, ground. Relay T operates and locks over its outer lett front contact, lower contacts of cani 208, to ground at the trout contact of relay 201. The operation ol relay 20T opens the circuit oit `relay 205 Which relay releases opening the circuit ot relay L100. Relay 207 also connects ground troni the tront contact oifY relay 201, lower contacts of cam 208, right front contact of relay 20?, lower contacts of cam 215, non-inductive resistance 210, conductor 528, completing the locking circuitof relay 518 which was previously traced to conductor 528. Relay 519 being marginal does not operate through resistance 21,5.

Relay 207 also closes a circuit from battery through the winding of sequence switch magnet 210, upper right contact ot' cam 217, inner lett front contact oi" relay 207, upper lett and lower right contacts ot cain 218, baci; contact ot relay 205, right contact oit fain 218 to ground, advancing sequence switch 210 to position In position 2 ot sequence switch 210 the locking circuit otl relay 518 is extended over the upper right contact of cani 219 to ground, Where it is maintained until sequence switch 210 leaves position 18. The release ot relay 205 as previously described also removes ground from conductor 509, thus opening the circuit for relay 508.

The release ot relay 508 opens the locking circuit ot relay 508 and that relay also releases; `When sequence switch 210 reaches posit-ion 3, the circuit olf relay 201 is extended irom battery, outer' lett back contact of relay 284C, lett Winding ot' relay 201, right contacts of cani 218, lett back contact. of relay 205, lett contacts of cani 208, conductor 2li-9, and thence as previously traced to conduct-or 250, lett contacts ot cam 204, right back contact of relay 205, right Winding oit relay 201, right contact ot' relay 251i` to ground, so thatl relay V201 is maintained energized.

In the meantime the operation 505 as previously described closes `from battery through the winding of relay 530, right back contact ot relay 531, outer right 'front contact oit relay 505 to ground. Relay 580 operates and locks over its right front contact, bach Contact ot magnet 521, outer right contact ot relay 505 to ground. It also closes a circuit from battery through the winding oi allottcr magnet 410, lett contact ot cani 418, conductor 582, contact oi jack 501, lett front Contact of relay 505 to ground, advancing allotter 410 to position 2 in which position it is ready to allot another of relay a circuit leit contact of relay 508, to

Cal

link circuit tor use in connection with a subsequent call.

rthe operation ot relay trom battery through the winding or" relay 531, inner leitt front Contact ot relay 530 to ground at the outer right front contact ot relay 505. Relay closes a circuit from lzattery tluiough the magnet 520 which controls the operation ot switch 550, outer right `iront contact ot relay 531, right front contact ot relay 530, back Contact o'l magnet 521, outer right jt'ront contact ut' relay 505 to groundlt also opens the energizing circuit ot' relay 530. Switch 550 is then rotated under the control ot magnet 520 until it enan idle sender which is characterized by battery through a resistance on conduc tor 601. l'lilhen an idle sender is reached a circuit is closed 'from battery, inner back contact ot relay T01, resistance 700, conductor 601, terminal served by brush corresponding to the idle sender, inner right contact of relay 505, both windings ot relayT winding ot relay 53s', outer right contact ot' relay 505 to ground. Relay 533 operates and short circuits its high resi tance winding per mitting n'iarginal relay 534i to operate. rl`he operation of relay 53l closes a circuit 'from battery through stop magnet 521, contact of relay 534, outer right contact ot relay 505 to ground.

ilagnet operates and opens the locking circuit ot relay 530 and the energizingl circuit for magnet 520. Relay and magnet 520 release. Relay 530 on releasing closes a holding circuit Afor magnet over the inner lett Ytrout contact ot relay 531, right bach contact ot relay 530, outer right contact ot relay 505 to ground. rthis circuit is in shunt ot the windings ot relays 533. and 534: so that these relays release. lilith relays and 50S released and relays 502 and 531 operated a circuit is closed from battery through the winding ot relay 535, outer right trout contact ot relay 502. outer lett back contact oit relay 530, outer lett contact of relayv 531, right haelt contact ot relay 503 to `ground. Relay 535 in operating yextends the fundamental tip and ring conductors and certain control conductors Jfrom the district selector to the sender. lt also closes a circuit: from ground through re- Ainc-e 530. brush 523 and its correspondinl contact, conductor (S02, lett winding ot relay 003. outer lett back contact of relay 'T01 ,"windine of relay 7 02 to battery. Relay 02 operates, but relay 003 being` marginal does not. Relay T02 locks to its energizing circuit independent o'lI the contact ot relay '701.

lt also closes an obvious energizing circuit 'lor relay 701 which in operating removes battery 'trom conductor G01 toA mark the sender busy to other linlr circuits. The op- 530 closes a circuit 'v eration of relay 535 also closes a circuit 'from battery, through the winding ot relay 205, lower contacts of cam 214, conductor 529, brush 514 and the terminal served thereby, lett winding ot relay 519, inner lett contact of relay 535, brush 524 and its corresponding contact, right winding ot' relay 603, lett back contact oli relay 60st, right bach cont-act ot relay 703, outer lett front contact ot relay 702 to ground. Relays 519 and G03 being ditlerential the completion ot' this circuit does not cause the operation oil either relay. Relay 205 operates and connects the trunk 2&9 and 250 through to the pulsing relays ot the sender, disconnecting it from the windings of relay 201. r'his relay releases and releases relay 207.

Relay T02 in operating also closes a circuit from battery, through the winding of relay 005, llo. 1 terminal and brush 014: of timing switch 000, lett bach Contact ot relay 600, conductor T, lower right contactof cam 1000, lower leit't contact oit relay 1001, conductor 1002, outer right contact of relay T02 to ground. Relay 005 operates and locks to its energizing circuit independent of the timing switch. rlhe operation ot relay 605 initiates a timingl operation which will be more completely described later.

[Eef/sindicar of @all 7);/ relay @all indicator pulses.

A pulsing circuit extends troni sender ft tl'irough the district and otlice selectors, conductor 2st-9, lett contacts of cam 203, outer lett front contact ot relay 205, lower right cont-act ot cam 212, upper right contact ot' cam 221, conductor 533, brush 516, middle right Contact otl relay 535, brush 526, conductor 619, inner lett back contact of relay i 03, right back Contact ot relay 704, winding ot marginal relay 705, winding ot negatively polarized relay 706, winding ot positively polarized relay 707, inner lett back contact of relay 704:, lett contacts ot cam 900, conductor 618, brush 525, inner right contact ot relay 535, brush 515, conductor 537, upper contacts ot cam 220, outer right front contact of relay 205, lett contacts ot cam a, conductor 250 and thence through the o'lhce. and district selectors to the sender 10i.

The completion ot this circuit, due to the operation of relay 205, initiates certain operations at the sender 10iY which result in the transmission of code impulse-s to corresnond to the number of the wanted lines. For a description ot these operations reference may be made to the bore mentioned Patent No. Lil-.641,084 to A. l. Lundell et al., issued August 7, 1923.

i-rs previously indicated relay 705 being marginal responds only to heavy impulses, relay 700 responds only to negative pulses and relay 'T07 responds only to positive pulses. Assume that the number ot the wanted subscriber is CHElsea 5678. The

p grounded conductor 730. Relabe transmitted to designation are as folcode impulses which will correspond to this lows:

light negative. heavy negative. heavy negative. heavy negative. {light positive.

heavy negative. heavy negative.

The first impulse over the above traced pulsing circuit causes the operation of relays 705 and 706. The operation of relay 7 06 closes a circuit trom battery through the left Winding of relay 709, Winding' ot relay 708, left back Contact of relay 709, contact ot' relay 706, conductor 730, lower left contact of cam 1003, conductor 888, outer lett liront contact of relay 702 to ground. Relay 7 08 opera-tes in this circuit, but the current through the right Winding ot relay 709 is not suliicient to cause that relay to operate. The operation ol' relay 708 closes a locking circuit for itself extending from battery, through the left Winding of relay 709, Winding o'l relay 708, right Winding of relay 709, inner lett front Contact of relay 708 to f 7 09 does not operate in this locking circuit since its right energizing Winding is shunted by the energizing' circuit of relay 708.

Relay 7 08 in operating also closes a circuit from battery through the Winding of relay 710, left back Contact of relay 711, outer left Contact ol' relay 7-08, to ground on conductor 730. Relay 710 operates and closes a locking circuit ior itself through the winding ot relay 711, inner right front contact or' relay 710 to grounded conductor 730. Relay 711 does not operate in this looking circuit, being shunted by the energizing circuit ot relay 710. The operation ot' relay 705 closes a circuit from battery, through the left Winding of relay 802, conductor 805, inner right back contact of relay 711, conductor 731, right back Contact of relay 709, trout contact ott relay 705 to ground. Relay 802 operates and locks over its right contact to conductor 888, outer left front contact ot relay 702 to ground. When this impulse ceases, the circuit of relays 706 and 705 is opened and relay 7 06 opens at its contact the energizing circuit of relay 708, permitting relay 7 09 to operate in the locking circuit of relay 708.

Y When the next impulse is received, only relay 706 is operated. Relay 706 closes at its front contact a. circuit through the left holding Winding of relay 709, front contact of relay 706, to grounded conductor 730. This circuit is in shunt of the Winding of relay 708 and releases that relay. With relay 708 released the original energizing circuit for relay 710 is opened, but a substitute circuit is already closed at the inner right contact oi relay 709.

Since relay 7 05 is not operated none of the relays of the regi-ster 800 is operated in response to this impulse. At the end of the impulse relay 706 releases, releasing relay 709 which in turn opens the energizing circuit of relay 710 and permits relay 711 to operate in the locking circuit of relay 710. This completes the reception of the tandem hundreds digit resulting in the operation of relay 802.

The lirst impulse of the group corresponding to the tandem tens digit is a light negative impulse and causes the operation of relay 706 alone. Relay 706 causes the operation and locking of relay 708 in the manner previously. described. Relay 708 in operating closes a circuit from battery through the Winding of relay 712, left back contact of relay 713, inner left front contact of relay 711, outer left front contactl of relay 708 to grounded conductor 730. Relay 712 operates and locks through the Winding of relay 713 to grounded conductor 730. At the end of the first pulse, relay 7 06 releases and relay 709 operates in the locking circuit of relay 708. The next pulse being a light positive pulse causes the operation of relay 707 which in turn closes a circuit from battery through the left Winding of relay 813, conductor 816, right back contact of relay 714, outer right front contact of relay 712, conductor 733, right front contact of relay 708, contact of relay 707 to grounded conductor 730. Relay 813 operates and locks over its right front contact to grounded conductor 888.

In response to the next impulse relay 706 alone is operated, causing the release of relay 7 08 and at its release, the release of relay 709 and the operation of relay 713 in the locking circuit of relay 712. Relay 813 is the only relay of tandem tens register 810 to be operated.

In response to the lirst digit, relay 707 is operated completing a circuit from battery through the left Winding of relay 821, conductor 825, left back contact of relay 714, left front contacts of relay 712 and 710, conductor 732, right back contact of relay 708, front contact of relay 707 to impulse of the next 

